Pretty sure most people are only doing this because it's an effective catch-all for the grand bulk of venues/free company spam and not for malicious reasons.

If anything, this shows why a 10 word limit was a mistake because people now have to optimize their filters and unfortunately that leads to unintentional side effects. It's much akin to how some people are also going to filter "gil" "gold" and "music" even knowing it's going to snag normal chat that has nothing to do with RMT or clubs.